/* * Copyright (C) 2004 Wim Taymans * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #include #define BLEND_NORMAL(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \ U = ((U1*(255-alpha))+(U2*alpha))>>8; \ V = ((V1*(255-alpha))+(V2*alpha))>>8; #define BLEND_ADD(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ Y = Y1+((Y2*alpha)>>8); \ U = U1+(((127*(255-alpha)+(U2*alpha)))>>8)-127; \ V = V1+(((127*(255-alpha)+(V2*alpha)))>>8)-127; \ if (Y>255) { \ gint mult = MAX (0, 288-Y); \ U = ((U*mult) + (127*(32-mult)))>>5; \ V = ((V*mult) + (127*(32-mult)))>>5; \ Y = 255; \ } \ U = MIN (U,255); \ V = MIN (V,255); #define BLEND_SUBTRACT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ Y = Y1-((Y2*alpha)>>8); \ U = U1+(((127*(255-alpha)+(U2*alpha)))>>8)-127; \ V = V1+(((127*(255-alpha)+(V2*alpha)))>>8)-127; \ if (Y<0) { \ gint mult = MIN (32, -Y); \ U = ((U*(32-mult)) + (127*mult))>>5; \ V = ((V*(32-mult)) + (127*mult))>>5; \ Y = 0; \ } #define BLEND_DARKEN(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ if (Y1 < Y2) { \ Y = Y1; U = U1; V = V1; \ } \ else { \ Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \ U = ((U1*(255-alpha))+(U2*alpha))>>8; \ V = ((V1*(255-alpha))+(V2*alpha))>>8; \ } #define BLEND_LIGHTEN(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ if (Y1 > Y2) { \ Y = Y1; U = U1; V = V1; \ } \ else { \ Y = ((Y1*(255-alpha))+(Y2*alpha))>>8; \ U = ((U1*(255-alpha))+(U2*alpha))>>8; \ V = ((V1*(255-alpha))+(V2*alpha))>>8; \ } #define BLEND_MULTIPLY(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ Y = (Y1*(256*(255-alpha) +(Y2*alpha)))>>16; \ U = ((U1*(255-alpha)*256)+(alpha*(U1*Y2+128*(256-Y2))))>>16; \ V = ((V1*(255-alpha)*256)+(alpha*(V1*Y2+128*(256-Y2))))>>16; #define BLEND_DIFFERENCE(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ Y = ABS((gint)Y1-(gint)Y2)+127; \ U = ABS((gint)U1-(gint)U2)+127; \ V = ABS((gint)V1-(gint)V2)+127; \ Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \ U = ((U*alpha)+(U1*(255-alpha)))>>8; \ V = ((V*alpha)+(V1*(255-alpha)))>>8; \ if (Y>255) { \ gint mult = MAX (0, 288-Y); \ U = ((U*mult) + (127*(32-mult)))>>5; \ V = ((V*mult) + (127*(32-mult)))>>5; \ Y = 255; \ } else if (Y<0) { \ gint mult = MIN (32, -Y); \ U = ((U*(32-mult)) + (127*mult))>>5; \ V = ((V*(32-mult)) + (127*mult))>>5; \ Y = 0; \ } \ U = CLAMP(U, 0, 255); \ V = CLAMP(V, 0, 255); #define BLEND_EXCLUSION(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ Y = ((gint)(Y1^0xff)*Y2+(gint)(Y2^0xff)*Y1)>>8; \ U = ((gint)(U1^0xff)*Y2+(gint)(Y2^0xff)*U1)>>8; \ V = ((gint)(V1^0xff)*Y2+(gint)(Y2^0xff)*V1)>>8; \ Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \ U = ((U*alpha)+(U1*(255-alpha)))>>8; \ V = ((V*alpha)+(V1*(255-alpha)))>>8; \ if (Y>255) { \ gint mult = MAX (0, 288-Y); \ U = ((U*mult) + (127*(32-mult)))>>5; \ V = ((V*mult) + (127*(32-mult)))>>5; \ Y = 255; \ } else if (Y<0) { \ gint mult = MIN (32, -Y); \ U = ((U*(32-mult)) + (127*mult))>>5; \ V = ((V*(32-mult)) + (127*mult))>>5; \ Y = 0; \ } \ U = CLAMP(U, 0, 255); \ V = CLAMP(V, 0, 255); #define BLEND_SOFTLIGHT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ Y = (gint)Y1+(gint)Y2 - 127; \ U = (gint)U1+(gint)U2 - 127; \ V = (gint)V1+(gint)V2 - 127; \ Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \ U = ((U*alpha)+(U1*(255-alpha)))>>8; \ V = ((V*alpha)+(V1*(255-alpha)))>>8; \ if (Y>255) { \ gint mult = MAX (0, 288-Y); \ U = ((U*mult) + (127*(32-mult)))>>5; \ V = ((V*mult) + (127*(32-mult)))>>5; \ Y = 255; \ } else if (Y<0) { \ gint mult = MIN (32, -Y); \ U = ((U*(32-mult)) + (127*mult))>>5; \ V = ((V*(32-mult)) + (127*mult))>>5; \ Y = 0; \ } \ #define BLEND_HARDLIGHT(Y1,U1,V1,Y2,U2,V2,alpha,Y,U,V) \ Y = (gint)Y1+(gint)Y2*2 - 255; \ U = (gint)U1+(gint)U2 - 127; \ V = (gint)V1+(gint)V2 - 127; \ Y = ((Y*alpha)+(Y1*(255-alpha)))>>8; \ U = ((U*alpha)+(U1*(255-alpha)))>>8; \ V = ((V*alpha)+(V1*(255-alpha)))>>8; \ if (Y>255) { \ gint mult = MAX (0, 288-Y); \ U = ((U*mult) + (127*(32-mult)))>>5; \ V = ((V*mult) + (127*(32-mult)))>>5; \ Y = 255; \ } else if (Y<0) { \ gint mult = MIN (32, -Y); \ U = ((U*(32-mult)) + (127*mult))>>5; \ V = ((V*(32-mult)) + (127*mult))>>5; \ Y = 0; \ } \ #define BLEND_MODE BLEND_NORMAL #if 0 #define BLEND_MODE BLEND_NORMAL #define BLEND_MODE BLEND_ADD #define BLEND_MODE BLEND_SUBTRACT #define BLEND_MODE BLEND_LIGHTEN #define BLEND_MODE BLEND_DARKEN #define BLEND_MODE BLEND_MULTIPLY #define BLEND_MODE BLEND_DIFFERENCE #define BLEND_MODE BLEND_EXCLUSION #define BLEND_MODE BLEND_SOFTLIGHT #define BLEND_MODE BLEND_HARDLIGHT #endif /* note that this function does packing conversion and blending at the * same time */ void gst_videomixer_blend_ayuv_ayuv (guint8 * src, gint xpos, gint ypos, gint src_width, gint src_height, gdouble src_alpha, guint8 * dest, gint dest_width, gint dest_height) { gint alpha, b_alpha; gint i, j; gint src_stride, dest_stride; gint src_add, dest_add; gint Y, U, V; src_stride = src_width * 4; dest_stride = dest_width * 4; b_alpha = (gint) (src_alpha * 255); /* adjust src pointers for negative sizes */ if (xpos < 0) { src += -xpos * 4; src_width -= -xpos; xpos = 0; } if (ypos < 0) { src += -ypos * src_stride; src_height -= -ypos; ypos = 0; } /* adjust width/height if the src is bigger than dest */ if (xpos + src_width > dest_width) { src_width = dest_width - xpos; } if (ypos + src_height > dest_height) { src_height = dest_height - ypos; } src_add = src_stride - (4 * src_width); dest_add = dest_stride - (4 * src_width); dest = dest + 4 * xpos + (ypos * dest_stride); /* we convert a square of 2x2 samples to generate 4 Luma and 2 chroma samples */ for (i = 0; i < src_height; i++) { for (j = 0; j < src_width; j++) { alpha = (src[0] * b_alpha) >> 8; BLEND_MODE (dest[1], dest[2], dest[3], src[1], src[2], src[3], alpha, Y, U, V); dest[0] = 0xff; dest[1] = Y; dest[2] = U; dest[3] = V; src += 4; dest += 4; } src += src_add; dest += dest_add; } } #undef BLEND_MODE /* fill a buffer with a checkerboard pattern */ void gst_videomixer_fill_ayuv_checker (guint8 * dest, gint width, gint height) { gint i, j; static const int tab[] = { 80, 160, 80, 160 }; for (i = 0; i < height; i++) { for (j = 0; j < width; j++) { *dest++ = 0xff; *dest++ = tab[((i & 0x8) >> 3) + ((j & 0x8) >> 3)]; *dest++ = 128; *dest++ = 128; } } } void gst_videomixer_fill_ayuv_color (guint8 * dest, gint width, gint height, gint colY, gint colU, gint colV) { gint i, j; for (i = 0; i < height; i++) { for (j = 0; j < width; j++) { *dest++ = 0xff; *dest++ = colY; *dest++ = colU; *dest++ = colV; } } }